Dealers sharing vs keeping their own tokes

[David M]

I understand that in most houses the dealer keeps their own tokes which is the incentive to deal a swift and pleasant game.

Some pool the tokes.

Would anyone know where I could find any hard data that would show how many hands per down a dealer gets out under each of those scenarios?

I was directed to Masons 3 Essays, and after a quick scanning didn't find anything.

Thanks for any consideration I could receive, David